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MotoMannequin

Livermore, CA, US
8582 posts

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"RE: D600 vs D7000"

MotoMannequin Awarded for his extraordinary skills in landscape and wildlife photography Registered since 11th Jan 2006
Fri 12-Oct-12 12:20 AM

>>It turns out that most of the advantage for FX cameras
>comes
>>from simply having a 2.25x larger sensor, which collects
>2.25x
>>more light.
>
>Your logic is wrong: A given lens transmits a certain and
>limited amount of light (= photons) per time unit. If you have
>a larger senser and more pixels, you spread the same amount of
>light over a larger area, which gives LESS amount of light
>(photoms) per pixel, and the signal-to-noise level will drop,
>which will also decrease the dynamic range. It's simple
>physics.

It is physics and it is simple, yet when your conclusions aren't actually borne out in real world usage, maybe it's time to examine the assumptions:

In the real world you don't shoot "a given lens," you compose a picture. Why is this relevant? Because you'll compose your image with a different lens for an FX sensor than you will for a DX sensor.

Let's for example say you compose a picture with a 35mm lens at f/8 on a DX camera. Your exit pupil is 35mm/8 = 4.35mm. Now compose the same picture on FX, you'll use a 50mm lens at f/8. Your exit pupil is 6.25mm. 1.5x larger diameter = 2.25x larger area = 2.25x more light.

Can you explain how a D800 beats a D7000 by more than a full stop in dynamic range, despite (according to DxO) both cameras having nearly identical pixel-level performance?

Larry - a Bay Area Nikonian
My Nikonians gallery

www.tempered-light.com

This is a hot, active topic! D600 vs D7000 [View all] , BillS52 Silver Member , Thu 27-Sep-12 05:31 PM
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